Fun little game, but a bit rough.
Make sure that the window size doesn’t affect gameplay. On first launch, the screen was small and made some of the first enemies only need a small distance, compared to when I fullscreened. No Start screen is a little jarring too with the waves (re)starting immediately.
Speed of shooting feels quite slow compared to the enemies, and especially the amount of enemies early on. By the time I can shoot down one enemy, there would be another already getting too close.